Meta is seeking a Security Engineer to join our Applied Artificial Intelligence (AAI) organization. As a Security Engineer in AAI, you will apply deep domain expertise to solve hard, real-world security problems, building novel security capabilities, prototyping AI-powered defenses, and advancing the frontier of what AI systems can do in security. Your work is AI-augmented from day one: you leverage AI tools and agents to accelerate your impact, and where the models fall short, your expertise directly drives their improvement.

You will blend hands-on security engineering with applied research: designing and executing novel approaches to security challenges that push both the state of Meta's security posture and the state of the art in AI-driven security. This includes building security products and tools, conducting original adversary research, developing detection and response capabilities, and translating security expertise into scalable, AI-native systems. Your domain knowledge — whether in detection engineering, threat intelligence and adversary analysis, cloud security, adversary simulation, mobile and platform security, forensic investigation, or emerging areas like AI/ML security — becomes the foundation for capabilities no existing AI system can replicate.

This role is for security practitioners who want to operate at the intersection of deep security expertise and frontier AI — not just using AI as a tool, but shaping what it becomes. Security Engineer, Applied AI ResponsibilitiesApply deep security domain expertise to identify, scope, and solve complex security problems that require multi-step reasoning, novel approaches, and expert judgmentBuild security products, tools, and capabilities — prototyping AI-driven solutions to real-world security challenges at Meta's scaleDesign and execute adversarial research, threat intelligence analysis, detection engineering, platform security research, or investigation workflows augmented by AI tools and agentsIdentify where AI models lack security reasoning capability and directly contribute to improving them through expert-generated signals, evaluation, and feedbackDevelop novel methodologies and reusable approaches that advance both Meta's security posture and AI system performance in security domainsCollaborate with model researchers to translate security expertise into training signal — decomposing hard problems into structured challenges that teach models to reason like security expertsPartner cross-functionally with engineering, product, and research teams to incorporate security innovations into production AI systemsDrive end-to-end execution of complex security initiatives with independence, contributing to the technical direction within the teamDisseminate findings through internal publications, knowledge sharing, and contributions to the broader security communityMinimum QualificationsB. S. or M.S. in Computer Science, Cybersecurity, or a related field, or equivalent experience5+ years of hands-on security engineering experience in one or more domains: detection engineering, threat intelligence, incident response, cloud security, adversarial simulation, offensive security, mobile/platform security, or digital forensicsExtensive knowledge of attacker tactics, techniques, and proceduresProficiency in coding with experience in languages such as Python, Go, C/C++, or shell scriptingExperience building security systems, tools, or capabilities — not just identifying problems but engineering solutionsDemonstrated ability to operate independently on complex, ambiguous security challengesPreferred QualificationsExperience with forensic investigation — reconstructing attack timelines from evidence across multiple sourcesDemonstrated ability to integrate AI tools to optimize/redesign workflows and drive measurable impact (e.g., efficiency gains, quality improvements)Demonstrated ongoing AI skill development (e.g., prompt/context engineering, agent orchestration) and staying current with emerging AI technologiesContributions to the security community (original research, tools, CTF design, conference presentations, publications, vulnerability disclosures)Background in supply chain security, mobile platform security, network protocol security, or AI/agent securityExperience adhering to and implementing responsible, ethical AI practices (e.g., risk assessment, bias mitigation, quality and accuracy reviews)Experience improving AI model performance through expert feedback, red-teaming, or evaluation designExperience in planning and executing adversary simulation campaigns or purple team exercises at scaleExperience with mobile platform security (iOS/Android), including IPC exploitation, secure enclave analysis, or platform-specific vulnerability researchExperience with cloud security operations (AWS/GCP/Azure), cloud detection and response, or cloud-native defenseExperience in creating structured methodologies that scale security expertise across teamsAbout Meta Meta builds technologies that help people connect, find communities, and grow businesses. When Facebook launched in 2004, it changed the way people connect. Apps like Messenger, Instagram and WhatsApp further empowered billions around the world. Now, Meta is moving beyond 2D screens toward immersive experiences like augmented and virtual reality to help build the next evolution in social technology. People who choose to build their careers by building with us at Meta help shape a future that will take us beyond what digital connection makes possible today—beyond the constraints of screens, the limits of distance, and even the rules of physics. For those who live in or expect to work from California if hired for this position, please click here for additional information. United States of America: $154,000/year to $217,000/year + bonus + equity + benefitsIndividual compensation is determined by skills, qualifications, experience, and location. Compensation details listed in this posting reflect the base hourly rate, monthly rate, or annual salary only, and do not include bonus, equity or sales incentives, if applicable. In addition to base compensation, Meta offers benefits. Learn more about benefits at Meta.